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L-Glucosylceramide: Synthesis, Properties, and Resistance

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L-Glucosylceramide: Synthesis, Properties, and Resistance Proc. Natl. Acad. Sci. USA Vol. 76, No. 7, pp. 3083-3086, July 1979 Biochemistry L-Glucosylceramide: Synthesis, properties, and resistance to catabolism by glucocerebrosidase in vitro (glucocerebroside/Gaucher disease/animal model/chemical sphingolipidosis) ANDREW E. GAL, PETER G. PENTCHEV, JANICE M. MASSEY, AND ROSCOE 0. BRADY Developmental and Metabolic Neurology Branch, National Institutes of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20205 Contributed by Roscoe 0. Brady, March 16, 1979 ABSTRACT Procedures for the synthesis and radioactive activity by the administration of conduritol-3-epoxide to induce labeling of L-glucosylceramide are described. This compound a syndrome resembling Gaucher disease in mice (6). However, is a stereoisomeric analogue of D-glucosylceramide which oc- the quantity of glucosylceramide that accumulated in liver and curs in nature and accumulates in pathological quantity in the 2- to 3-fold than that in normal mice organs and tissues of patients with Gaucher disease. The prop- spleen was only greater erties of L-glucosylceramide that have been examined so far and is therefore far below that found in patients with Gaucher have been found to be indistinguishable from those of the nat- disease (4). In addition, the typical Gaucher bodies or tubular urally occurring glycolipid. However, L-glucosylceramide is structures characteristic of the disorder were not observed in completely refractory to enzymatic hydrolysis by purified pla- spleen, liver, or bone marrow of mice treated with this reagent cental glucocerebrosidase and enzyme(s) present in whole tissue (7). extracts. It is anticipated that L-glucosylceramide will be a disease model at uniquely useful substance for exploring pathogenetic processes Because of the lack of a suitable Gaucher in animal analogues of Gaucher disease. the enzyme level, investigators have attempted with little success, to produce Gaucher disease-like lesions by the ad- The pathogenesis of most lysosomal storage disorders is poorly ministration (intraperitoneally or orally) of high levels of understood at this time although clear definitions of the primary galactosylceramide to rats and rabbits (8). When radioactive enzymatic lesions often exist (1). Because of this situation, in- glucosylceramide was administered intravenously to rats, it was formation relating to the pathologic manifestations of these rapidly cleared from the plasma and taken up by the reticulo- diseases has depended primarily on descriptions of clinical endothelial system where it was quickly catabolized, and no courses in patients afflicted with these disorders and on the accumulation could be demonstrated (unpublished data). The findings at postmortem examinations. The pathogenetic basis pronounced susceptibility of glucosylceramide to normal cat- of the anatomical and physiological alterations of these disorders abolic processes pointed to the desirability of attempting to has been largely confined to speculation. Gaucher disease is a prepare a substrate analogue with the chemical and physical classic example of this dilemma. This disorder is caused by a properties of the natural glycolipid but with the added feature deficiency of glucocerebroside-3-glucosidase activity in the of its being resistant to enzymatic hydrolysis. It was considered tissues of affected individuals (2). It has recently been shown likely that glucosylceramide containing L-glucose instead of in a patient with non-neuropathic form of the disorder (type the naturally occurring D-glucose might be useful in this re- I) that this deficiency arises from a structural mutation in the gard. enzyme that results in markedly decreased hydrolysis of glu- We describe here the syntheses of 1-O-3-D-glucosyl-N- cosylceramide without apparent effect on the affinity of the palmitoyl-DL-sphingosine and 1-O-3-L-glucosyl-N-palmi- enzyme for the substrate (3). The molecular bases that distin- toyl-DL-sphingosine and compare the chemical and physical guish the two neuropathic forms of Gaucher diseases (types II properties of the two stereoisomers. In addition, the catabolic and III) from type I Gaucher disease are not known. In addition, inertness of L-glucosylceramide in vitro is demonstrated. the pathophysiologic consequences of the accumulation of glucosylceramide are poorly understood. For example, it has MATERIALS AND METHODS been observed that there is a wide variation in the quantity of Materials glucosylceramide in the liver of patients with Gaucher disease Silica gel 60 (E. Merck) plates were used for thin-layer chro- and that there often is little or no correlation of this accumu- matography. The migration of glycolipids was visualized by lation with (i) the level of residual glucocerebrosidase activity charring with ammonium bisulfate (9). The silica gel used for or (ii) the severity of the clinical manifestations (4). column chromatography was Bio-Sil HA (minus 35 mesh; The availability of an experimental model of Gaucher disease Bio-Rad) that was activated prior to use by heating at 1100C seems to be a paramount requirement for answering many of for 12 hr. Hydrogen bromide in acetic acid was obtained from these puzzling questions. Although a strain of mutant BALB/c Koch-Light Labs (Colnbrook, England). Radioactive mea- mice with hepatic and splenic accumulation of glucocerebroside surements were carried out in a Searle mark III liquid scintil- has recently been reported, the clinical manifestations of the lation system using Aquasol (New England Nuclear). 3-0- disease in these mice are not typical of Gaucher disease (5). Benzoyl-N-palmitoyl-DL-sphingosine, mp 77-78, and 1-0- Investigators have attempted to inhibit glucocerebrosidase 3-D-glucopyranosyl-N-[1-14Clstearoyl-DL-sphingosine (0.315 mCi/mmol; 1 Ci = 3.7 X 1010 becquerels) were kindly provided The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "ad- by D. Shapiro. L-[1-14C]Glucose was purchased from New vertisement" in accordance with 18 U. S. C. §1734 solely to indicate England Nuclear. Unlabeled L-glucose was obtained from this fact. Sigma. Radioscans were made with a series 6000 Varian 3083 Downloaded by guest on September 24, 2021 3084 Biochemistry: Gal et al. Proc. Natl. Acad. Sci. USA 76 (1979) (Berthold) radioscanner. Melting points were taken on a Thomas-Hoover melting point apparatus and are reported corrected. Synthesis of glucocerebrosides 1,2,3,4,6-Penta-O-acetyl-,-L-glucopyranoside. A mixture of 5.4 g (30 mmol) of L-glucose, 30 ml of acetic anhydride, and 2.5 g of previously melted sodium acetate was heated at 950C for 2 hr. The mixture was decomposed with 12.0 g of ice water, stirred for 3 hr at 00C, and kept for 1 day at 250C. The pre- cipitate was filtered and washed with 600 ml of water, dried on the filter, and washed with 60 ml of benzene/hexane, 1:1 (vol/vol). The product was recrystallized from ethanol (600 ml). The yield was 5.8 g (50%) having a melting point of 130-1310C. On thin-layer chromatography in cyclohexane/benzene/iso- propylether/pyridine, 115:20:20:25 (vol/vol), the pentaacetate had RF 0.33. Pentaacetyl-D-glucopyranoside had the same RF value in this system: 2,3,4,6-Tetra-O-acetyl-a-L-glucopyranosyl Bromide. A A B c solution of 3.9 g (10 mmol) of L-pentaacetylglucose in 20 ml of 45% (wt/vol) hydrogen bromide in acetic acid was kept at 4VC FIG. 1. Radioscan of a thin-layer chromatogram of 1-0; for 18 hr and subsequently at 250C for 4 hr. The mixture was f3-L-glucopyranosyl N-[1-14C]palmitoyl-DL-sphingosine. Lanes: A, then decomposed by the addition of 16 ml of ice water. The purified ceramide standard; B, L-[1-'4CJglucosyl ceramide; C, un- product was extracted with 300 ml of ether, and this solution reacted ceramide from the reaction mixture. The solvent system was was washed at 00C with three consecutive 400-ml portions of chloroform/methanol/water, 40:10:1 (vol/vol). a 0.5 M potassium bicarbonate. The product was dried over anhydrous calcium chloride, the solvent was evaporated, and were identical to those of the L isomer. From this reaction 300 the residue was recrystallized from 20 ml of isopropyl ether. mg (56%) of N-palmitoylsphingosine was recovered. The yield was 1.95 g (47%) with a melting point of 88-890C. 1-O-3-L-Glucopyranosyl-N{1-14C palmitoyl-DL-sphingo- Thin-layer chromatography in the above described system gave sine. This was prepared according to the method for the cor- an RF 0.47 for the bromide. The melting point and RF for the D-isomer were the same. 1-O-,-.L-GIucopyranosyI-.N-palmitoyl-DL-sphingosine. 3-O-Benzoyl-N-palmitoylsphingosine (642 mg; 1 mmol) was heated in 30 ml of nitromethane and 30 ml of benzene until 15 ml of the benzene had been distilled off. The mixture was cooled and 505 mg (2 mmol) of mercuric cyanide and 411 mg (1 mmol) of 2,3,4,6-tetra-0-acetyl-a-L-glucopyranosyl bromide was added. The mixture was heated with stirring at 720C for 2 days. After cooling, 200 ml of ether was added and the solu- tion was repeatedly washed with 0.5 M sodium bicarbonate until no mercuric ions were detected with a sodium sulfhydrate solution. The solvents were removed under reduced pressure and the residue was dissolved in 50 ml of methanol. Eight milliliters of 0.5 M sodium methylate in methanol was added; after 24 hr at room temperature, the mixture was neutralized with 0.23 ml of glacial acetic acid. To this solution were added 120 ml of chloroform and 36 ml of water. The suspension was shaken and the lower phase was washed once with the theo- retical upper phase (10) and evaporated; the residue was dis- solved in 400 ml of chloroform/methanol, 50:1 (vol/vol).
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